Nothing wrong with a little tidal power but just looking at the geography it will never be a significant source of power.
Another problem is the cost. The prices listed in the summary are very expensive electricity ... and those are the lowball figures used to get the project approved, not the "real" numbers. Offshore wind would be cheaper, and have far less environmental impact.
As an traditional power plant engineer, offshore wind costs seem staggeringly high to me. A 90m (300ft) tall tower in the middle of the ocean supporting a nacelle that weighs about 520 metric tons (1.15 million pounds) doesn't come cheap. Have you seen rate sheets for the cranes that are needed to assemble these turbines? On land, they average in the tens to hundreds of thousands of dollars per day.
At sea, with the need for a large vessel and all the crew that a large vessel requires to keep it operating, the cost is staggering. I spent a couple weeks aboard the Tolteca, a Mexican heavy-lift ship with a 2000 ton crane and a crew of about 250. Even using labor from the developing world, the costs are astronomical. We invoiced them millions of dollars of work and they didn't even blink. An offshore supply boat rents out (in good oil-boom times, maybe not right now) for hundreds of thousands of dollars per day. A heavy crane ship is probably in the millions per day. That's just for erecting the wind turbine, which is probably at least a 24 hour lift. You also need specialized vessels to lay high voltage cable across the sea floor. Adding "marine" or "offshore" to the name of anything is an excellent way to multiply the cost by at least 3.